I spent the day dealing with the Civil War and as a result, this is about the limit of my opera appreciation capacity:
I found the libretto both refreshingly direct and deceptively simple – the subtlety of the repeated numerical patterns in the text emerges only with repeated listening. The repetition of the musical phrases recalls Lieder like Schubert’s “Es war ein König” – it requires an experienced performer like Fleming to add the necessary nuance. The production I found somewhat uninspired (I believe there was a performance of this at Salzburg a few years back that involved two Mack trucks and a procession of zombie mimes?), though there is something to be said by just putting a curtain there – one so rarely sees performativity qua performativity rendered so directly.
All in all, an evening well spent.